Inject ResourceConfig instance (not class) into Jersey

If you inject the class (via a servlet parameter) it seems that
Jersey tries to create all the beans for you (and fails). I thought
it was supposed to work (according to the docs), so I'm a bit confused
but the sample now has Spring DI and the tests pass.

Fixes gh-1981

spring-boot-samples/spring-boot-sample-jersey/pom.xml

@@ -18,6 +18,7 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
+		<java.version>1.7</java.version>
 	</properties>
 	<dependencies>
 		<dependency>